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https://github.com/AsahiLinux/u-boot
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e0b04a1525
Add support for generation of unique MAC address that is derived from board serial. Algorithm for generation of MAC taken from LK. Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Miscellaneous Snapdragon functionality
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*
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* (C) Copyright 2018 Ramon Fried <ramon.fried@gmail.com>
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*
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*/
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#include <common.h>
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#include <mmc.h>
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#include <asm/arch/misc.h>
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/* UNSTUFF_BITS macro taken from Linux Kernel: drivers/mmc/core/sd.c */
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#define UNSTUFF_BITS(resp, start, size) \
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({ \
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const int __size = size; \
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const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
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const int __off = 3 - ((start) / 32); \
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const int __shft = (start) & 31; \
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u32 __res; \
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\
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__res = resp[__off] >> __shft; \
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if (__size + __shft > 32) \
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__res |= resp[__off - 1] << ((32 - __shft) % 32); \
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__res & __mask; \
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})
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u32 msm_board_serial(void)
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{
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struct mmc *mmc_dev;
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mmc_dev = find_mmc_device(0);
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if (!mmc_dev)
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return 0;
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return UNSTUFF_BITS(mmc_dev->cid, 16, 32);
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}
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void msm_generate_mac_addr(u8 *mac)
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{
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int i;
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char sn[9];
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snprintf(sn, 8, "%08x", msm_board_serial());
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/* fill in the mac with serialno, use locally adminstrated pool */
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mac[0] = 0x02;
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mac[1] = 00;
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for (i = 3; i >= 0; i--) {
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mac[i + 2] = simple_strtoul(&sn[2 * i], NULL, 16);
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sn[2 * i] = 0;
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}
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}
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